[Mailer] fixed the order of authenticators

Author: fabpot

Transport/Smtp/EsmtpTransport.php

@@ -38,10 +38,10 @@ public function __construct(string $host = 'localhost', int $port = 25, string $
         parent::__construct(null, $dispatcher, $logger);
 
         $this->authenticators = [
-            new Auth\PlainAuthenticator(),
+            new Auth\CramMd5Authenticator(),
             new Auth\LoginAuthenticator(),
+            new Auth\PlainAuthenticator(),
             new Auth\XOAuth2Authenticator(),
-            new Auth\CramMd5Authenticator(),
         ];
 
         /** @var SocketStream $stream */